Located on Hawaiian Electric Company property in downtown Honolulu, this 4,000 square feet facility was dedicated in April 2003. The test facility currently houses eight test stands for testing of single cells from 50 to 600 cm2 and small stacks (up to 5 kW). One of the smaller test stations was designed and built for high speed hardware-in-the-loop (HiL) testing to characterize dynamic performance of small fuel cell systems for vehicle applications (Figure 1).